1、BS EN ISO2871-2:2010ICS 71.100.40NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDSurface active agents Detergents Determination ofcationic-active mattercontentPart 2: Cationic-active matter of lowmolecular mass (between 200 and 500)(ISO 2871-2:2010)This British
2、Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2010. BSI 2010ISBN 978 0 580 68045 8Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 2871-2:2010National forewordThis British Standard is the UK implementation of EN ISO 2871-2:2
3、010.It supersedes BS EN ISO 2871-2:1994 which is withdrawn. The UK participation in its preparation was entrusted to TechnicalCommittee CII/34, Methods of test for surface active agents.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication
4、does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 2871-2 February 2010 ICS 71.100.40 Supers
5、edes EN ISO 2871-2:1994English Version Surface active agents - Detergents - Determination of cationic-active matter content - Part 2: Cationic-active matter of low molecular mass (between 200 and 500) (ISO 2871-2:2010) Agents de surface - Dtergents - Dtermination de la teneur en matire active cation
6、ique - Partie 2: Matire active cationique faible masse molculaire (entre 200 et 500) (ISO 2871-2:2010) Tenside - Waschmittel - Bestimmung des Gehaltes der kationaktiven Substanz - Teil 2: Kationaktive Substanz niedriger Molmasse (zwischen 200 und 500) (ISO 2871-2:2010) This European Standard was app
7、roved by CEN on 11 February 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such natio
8、nal standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and n
9、otified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Lu
10、xembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All r
11、ights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 2871-2:2010: EBS EN ISO 2871-2:2010EN ISO 2871-2:2010 (E) 3 Foreword This document (EN ISO 2871-2:2010) has been prepared by Technical Committee ISO/TC 91 “Surface active agents“ in collab
12、oration with Technical Committee CEN/TC 276 “Surface active agents” the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2010, and conflicting national
13、 standards shall be withdrawn at the latest by August 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes E
14、N ISO 2871-2:1994. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungar
15、y, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 2871-2:2010 has been approved by CEN as a EN ISO 2871-2:2010 without any modific
16、ation. BS EN ISO 2871-2:2010ISO 2871-2:2010(E) ISO 2010 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through I
17、SO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates
18、closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards.
19、Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this d
20、ocument may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 2871-2 was prepared by Technical Committee ISO/TC 91, Surface active agents. This second edition cancels and replaces the first edition (ISO 2871-2:1990), of which it con
21、stitutes a minor revision. ISO 2871 consists of the following parts, under the general title Surface active agents Detergents Determination of cationic-active matter content: Part 1: High-molecular-mass cationic-active matter Part 2: Cationic-active matter of low molecular mass (between 200 and 500)
22、 BS EN ISO 2871-2:2010BS EN ISO 2871-2:2010INTERNATIONAL STANDARD ISO 2871-2:2010(E) ISO 2010 All rights reserved 1Surface active agents Detergents Determination of cationic-active matter content Part 2: Cationic-active matter of low molecular mass (between 200 and 500) 1 Scope This part of ISO 2871
23、 specifies a method for the determination of low-molecular-mass cationic-active materials such as monoamines, amine oxides, quaternary ammonium compounds and alkylpyridinium salts which have a main chain of 10 to 22 carbon atoms and not more than 6 other carbon atoms in the cation. The method is als
24、o suitable for other cationic-active materials. The method is applicable to solids or to aqueous solutions of the active material when the relative molecular mass of the cationic-active matter is known or when it has been previously determined if its content is expressed as a percentage by mass. If
25、more than one type of cationic-active material is present, an estimate of average relative molecular mass may be used. The method is not applicable if anionic and/or amphoteric surface active agents are present. 2 Normative references The following referenced documents are indispensable for the appl
26、ication of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 385, Laboratory glassware Burettes ISO 607, Surface active agents and detergents Methods of sample division IS
27、O 1042, Laboratory glassware One-mark volumetric flasks ISO 2271:1989, Surface active agents Detergents Determination of anionic-active matter by manual or mechanical direct two-phase titration procedure ISO 3696, Water for analytical laboratory use Specification and test methods 3 Principle The cat
28、ionic-active matter in a sample is titrated in a two-phase (aqueous chloroform) system against a standard anionic surface active agent in the presence of an indicator consisting of mixed anionic and cationic dyes. The cationic surface active agent present in the sample initially reacts with the anio
29、nic dye to form a salt which dissolves in the chloroform layer, imparting a blue colour to this layer. During the titration, the anionic surface active agent displaces the anionic dye and, at the end point, forms a salt with the cationic dye, imparting a greyish-pink colour to the chloroform layer.
30、BS EN ISO 2871-2:2010ISO 2871-2:2010(E) 2 ISO 2010 All rights reserved4 Reagents During the analysis, use only reagents of recognized analytical grade and only distilled water or water of at least equivalent purity complying with the specifications for grade 3 of ISO 3696. 4.1 Chloroform, 20= 1,48 g
31、/ml, distilling between 59,5 C and 61,5 C. 4.2 Sodium lauryl sulfate (sodium dodecyl sulfate) CH3(CH2)11OSO3Na, standard volumetric solution, c(C12H25NaO4S) = 0,004 mol/l. While preparing the standard volumetric solution as described in 4.2.2, check the purity of the solid sodium lauryl sulfate used
32、 as described in 4.2.1. 4.2.1 Determination of purity of sodium lauryl sulfate. Weigh, to the nearest 1 mg, 5 g 0,2 g of the solid product into a 250 ml round-bottomed flask with ground-glass neck. Add exactly 25 ml of a standard volumetric sulfuric acid solution, c(H2SO4) = 1 mol/l, and reflux usin
33、g a water condenser. During the first 5 min to 10 min, the solution will thicken and tend to foam strongly; control this by removing the source of heat and swirling the contents of the flask. In order to avoid excessive foaming, instead of refluxing, the solution may be left on a boiling water bath
34、for 60 min. After a further 10 min, the solution will become clear and foaming will cease. Reflux for a further 90 min. Remove the source of heat, cool the flask and carefully rinse the condenser with 30 ml of ethanol followed by water. Add a few drops of ethanolic phenolphthalein solution (concentr
35、ation 10 g/l), and titrate the solution with sodium hydroxide solution c(NaOH) = 1 mol/l. Carry out a blank test by titrating 25 ml of the 1 mol/l sulfuric acid solution with the 1 mol/l sodium hydroxide solution. Calculate the purity, , expressed as a percentage by mass, of the sodium lauryl sulfat
36、e using the formula ()100128,84 VVcmwhere V0is the volume, in millilitres, of the 1 mol/l sodium hydroxide solution used for the blank test; V1is the volume, in millilitres, of the 1 mol/l sodium hydroxide solution used for the test portion of sodium lauryl sulfate taken; c0is the exact concentratio
37、n, expressed in moles of NaOH per litre, of the sodium hydroxide solution used; m1is the mass, in grams, of the test portion of sodium lauryl sulfate taken. 4.2.2 Preparation of standard volumetric sodium lauryl sulfate solution. Weigh, to the nearest 1 mg, between 1,14 g and 1,16 g of sodium lauryl
38、 sulfate and dissolve in 200 ml of water. Transfer the solution quantitatively to a 1 000 ml one-mark volumetric flask (5.3) fitted with a ground-glass stopper, and dilute to the mark with water. BS EN ISO 2871-2:2010ISO 2871-2:2010(E) ISO 2010 All rights reserved 3Calculate the exact concentration
39、c2, expressed in moles of C12H25NaO4S per litre, of the solution thus obtained, using the formula 2288,4 100m where m2is the mass, in grams, of sodium Iauryl sulfate used to prepare the solution; has the same meaning as in 4.2.1. 4.3 Mixed indicator solution1). 4.3.1 Stock solution. This solution sh
40、all be prepared from acid blue 1 and dimidium bromide. 4.3.1.1 Acid blue 12)(Colour Index 42045) (Hydrogen 4-4-(diethylamino)-2,4-disulfonatobenzhydrylidenecyclohexa-2,5-dien-1-ylidenediethylammonium, sodium salt). N + N SS OOOOO O Na +4.3.1.2 Dimidium bromide (3,8-diamino-5-methyl-6-phenylphenanthr
41、idinium bromide). N+N H 2 NH2Br 1) This mixed indicator is available commercially in the form of a basic solution, which should be acidified and diluted before use. 2) Acid blue 1, also known as disulfine blue VN 150, is an example of a suitable product available commercially. This information is gi
42、ven for the convenience of users of this part of ISO 2871 and does not constitute an endorsement by ISO of this product. BS EN ISO 2871-2:2010ISO 2871-2:2010(E) 4 ISO 2010 All rights reserved4.3.1.3 Preparation of the stock solution. Weigh, to the nearest 1 mg, 0,5 g 0,005 g of dimidium bromide (4.3
43、.1.2) into a 50 ml beaker, and 0,25 g 0,005 g of acid blue 1 (4.3.1.1) into a second 50 ml beaker. Add between 20 ml and 30 ml of hot 10 % (volume fraction) ethanol to each beaker. Stir until dissolved and transfer the solutions to a 250 ml one-mark volumetric flask. Rinse the beakers into the volum
44、etric flask with the ethanol and dilute to the mark with the ethanol. 4.3.2 Acid solution. Add 200 ml of water to 20 ml of the stock solution (4.3.1) in a 500 ml one-mark volumetric flask. Add 20 ml of approximately 245 g/l sulfuric acid solution, mix and dilute to the mark with water. Store in the
45、dark. 5 Apparatus Ordinary laboratory apparatus and the following: 5.1 Flask or measuring cylinder, 250 ml capacity, with ground-glass stopper. 5.2 Burette, 25 ml capacity, complying with the specifications for class A of ISO 385. 5.3 One-mark volumetric flask, 1 000 ml capacity, with ground-glass s
46、topper, complying with class A of ISO 1042. 6 Sampling The laboratory sample of the detergent shall be prepared and stored in accordance with instructions given in ISO 607. 7 Procedure 7.1 Test portion Weigh, to the nearest 0,5 mg, a sufficient amount of the laboratory sample to contain between 0,00
47、2 mol and 0,003 mol of cationic-active matter. Table 1, which has been calculated on the basis of a relative molecular mass of 360, may be used as a rough guide. Table 1 Guide to mass of test portion Expected cationic-active % (mass fraction) Mass of test portion g 10 10 20 5 100 1 Possible interfer
48、ences: BS EN ISO 2871-2:2010ISO 2871-2:2010(E) ISO 2010 All rights reserved 5 Low relative molecular mass sulfonates of toluene and xylene present as hydrotropes do not interfere when present in concentrations up to and including 15 % (mass fraction) with respect to the active material. At higher le
49、vels, their influence should be evaluated in each particular case. Non-ionic surface active agents, soap, urea and the salts of (ethylenedinitrilo)tetraacetic acid do not interfere. Typical inorganic components of detergent formulations, such as sodium chloride, sulfate, borate, tripolyphosphate, perborate, silicate, etc., do not interfere, but bleaching agents other than perborate shall be destroyed before the analysis, and the sample shall be completely soluble in water. 7.2 Determination D
